Integrated die-cast alloy bicycle frame and die-casting method thereof

Abstract

The invention provides an integrated die-cast alloy bicycle frame. The integrated die-cast alloy bicycle frame comprises a first bicycle frame pressing piece, a second bicycle frame pressing piece, a first rear beam pressing piece and a second rear beam pressing piece. The first bicycle frame pressing piece and the second bicycle frame pressing piece each comprise a front axle pressing part, a front beam pressing part, a saddle pressing part, a lower beam pressing part and a rear beam pressing part. The front axle pressing part, the front beam pressing part, the saddle pressing part and the lower beam pressing part of the first bicycle frame pressing piece and the front axle pressing part, the front beam pressing part, the saddle pressing part and the lower beam pressing part of the second bicycle frame pressing piece are press-formed correspondingly. According to the integrated die-cast alloy bicycle frame, the defects, caused by a traditional welding technique, that the strength is reduced and the attractiveness is affected by weld lines are avoided while the weight of the bicycle frame can be reduced. The invention further provides a pressing method of the integrated die-cast alloy bicycle frame. The pressing method of the integrated die-cast alloy bicycle frame comprises the steps of 3D designing, die opening, smelting, die manufacturing, gluing, pressing and the like. By the adoption of the method, the bicycle frame production process is simplified, and the bicycle frame production efficiency is improved.

Description

technical field [0001] The invention relates to a bicycle frame and a production method thereof, in particular to a bicycle alloy integral die-casting frame and a die-casting method thereof. Background technique [0002] At present, the materials that can be used to manufacture bicycle frames mainly include the following types: steel, aluminum alloy, titanium alloy, magnesium alloy, scandium alloy, carbon fiber, etc. The frames that appear on the general market mainly include steel, aluminum alloy, titanium alloy and carbon fiber. The bicycle frame was usually made of steel pipe at the earliest. The rigidity of the steel pipe frame is better, but the density of the steel is high, which will cause the weight of the bicycle. With the trend of lightweight bicycles, the share of the steel pipe frame has been gradually reduced. It is a variety of alloy frames. The alloy frame is thin and light, and its rigidity also meets the requirements of the bicycle frame. However, the curr...

AI Technical Summary

Problems solved by technology

However, the current alloy bicycle frames are all stamped and welded from pipes or plates, and the welding lines can be clearly seen on the appearance, and due to the high temperature and oxidation of welding, the incorporation of impurities, or poor welding, etc., the weld joints Defects such as decreased strength of nearby materials or open welding, and time-consuming manufacturing and high cost, affect the strength and appearance of the whole vehicle

[0003] In order to overcome the above technical defects, many bicycle manufacturers at home and abroad have begun to study new production processes for bicycle frames. For example, the Chinese patent "CN200820078729.0" discloses "a magnesium alloy integrated die-casting electric The electric frame adopts a die-casting integral molding process to avoid the strength drop caused by welding and the defects of welding techniques

But in fact, there is still a certain gap between the strength of magnesium alloy and steel. If no reinforcement is carried out during the die-casting process, the rigidity of the die-casted front beam or support beam is likely to be insufficient. The phenomenon that the frame is bent or even broken

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